busybox/fdflush.c

/* vi: set sw=4 ts=4: */
/*
 * Mini fdflush implementation for busybox
 *
 *
 * Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include "busybox.h"
#include <stdio.h>
#include <sys/ioctl.h>
#include <fcntl.h>

/* From <linux/fd.h> */
#define FDFLUSH  _IO(2,0x4b)

extern int fdflush_main(int argc, char **argv)
{
	int value;
	int fd;

	if (argc <= 1 || **(++argv) == '-')
		usage(fdflush_usage);

	fd = open(*argv, 0);
	if (fd < 0) {
		perror(*argv);
		return EXIT_FAILURE;
	}

	value = ioctl(fd, FDFLUSH, 0);
	/* Don't bother closing.  Exit does
	 * that, so we can save a few bytes */
	/* close(fd); */

	if (value) {
		perror(*argv);
		return EXIT_FAILURE;
	}
	return EXIT_SUCCESS;
}